Gun



Oct. 23, 1945;

o. O. SUNDERLAND GUN Filed Sept. 19, 1942 mmm w kNN/I 6 Sheets-Sheet l Hid-I u .eiwii:

INVENTOR D N A L R E D N U S O D L A W S O ATTORNEY' Oct. 23, 1945. '0. o. SUNDERLAND 2,387,

GUN

Filed Spt. 19, 1942 6 Sheets-Sheet 3' 93. FIG. n

INVENTOR OSWALD O. SUND E'R LAND BY a/I/ TTQRNEY Patented Oct. 23, 1945 UNI-Tho STATES PATENT oFFlcE GUN V. "QS alllQ SunQ I field, Conn.

' 1 Application september 19, 1942, Serial No. 458,932

. 11 Claims.

Thi t on e ates to new and u e u 1m:

provement 'lfn g ns'a-nd hasila iicular, r l t on t l a sun which may be l$das f llly or e ia t matiq weapongags elected lovt'he operator, only a slight manipulation being required to convert. the gun from one ty e to the other; 1 object of the invention is to provide a gun in whichthe shell s lnlthe firing chamber the bolt andflrine in a e i r'wa rd a a h tth the shell'loefore the hammer issnal ji ec whereby there is no forward movement. of the belt or other part/(With the exception" of the hammer)' a ter t e, n i si ht d and-the trig r ul ed, allin a gun that may be" used asa fnllyor semi automatic gun as desired. v

Anothe object. is topic/idea igh er and more c m t b y s mm t Ew ng the a ove described characteristics. g If f 'Afu'rther obje'ctisto provide a gun including a. delaying means, comprising a pressure oper ated releasecatch; thattakes' the initial. shock of the firing explosion whereby there is no need fora heavy bolt or a heavy reco l spr g I Yet another object is" to i rovide in agun ha 1315 the characteristics of the immediately. preceding paragraph a manual which includes'means to release the catch or look lever Ito permit of malilial retraction'of the bolt. t

A furthercobject of theinvention to provideina gun of thetype indicated an improved r d e nd: mea to secu th same n a-g'un such mannerthat when the last shell O he cll il use the c i ls,. a li maiically d s-- connected from the gun.

Another object is to provide an improved construction and. assembly oi looltand firingpin tor use in a gun of the character indicated. I a

"Other objects andadvantages willbecome apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. However itis to .beunderstood that the invention is not limited to the details. disclosed but includesall uc a ns nd od fic t ns as, all withi the spirit of the invention andv the scopeoi the. appended claims.- a H Inthe-drawingsl 1 1 1 w i Fig. -1 is a top plan view of the gun of the invention, portions of the barrel andstock. being broken away; 1 s V Fig. 2 is a side elevational view of the gun as shownin Fig. 1; a

Fig.3fis a view similar to l t will the frame qoverpiece removed; H

Fig. 4 is a sectional view on a larger scale through the frame portion of the gun;

Fig. 5 is a transverse sectional view taken as along the plane of the line 5 5 of Fig. 4;

Fig. 6 .is' a sectional view taken as along the plane of the line 6 -6 of Fig. 4;

Fig. '7 is a sectional view taken as along the plane of the line 'l-Jof Fig. (I;

Fig. 8 is a sectional view taken as along the plane of the line 8.8 of Fig, l;

Fig. 9 is a view somewhat similar to Fig. 4 hut i h th bolt back and h o he Par s os ii hsli accordingly and with the clip nearly empty;

Fi 10 is a detail sectional view taken as along the plane of the line H] of Fig. ,9;

Fig. 11 is a horizontal sectional view taken as along the plane of the line ll-l l of Fig. 9;

Fig.12 is a horizontal sectional view through the gun bolt; t

Fig. 13 isa side elevational view of the g l bolt. F s- 14 is n n a g d.sss a v ew throu h the articulated connection between the bolt parts; V V

15 is a si e v ii al Vi w oi he in used t nn th l pa a d to c o erate with a latch means as willla-ter appear; I

Fig. 16is an elevational View of the said pin but at right angles to Fig. 15;

is a t les View of the ti n Pin o hegu o Fi 18 is a s d d o o al v ewof sa pin:

i 19 sat an w oi t e sun fram alone; 7

Fla 20 is a nt a l n it dina s o i n l vie i d ame: a

. F sis a ie y in top an a d a tl n on and sh wi g e m nn in which the forward part of the iratrle cover tits into the frame; a t

Fig. 22 is a sectional view taken as along the line 22-22 of Fig. 20;

Fig. 23 is a side eleyational view of the gun hammer alone;

, Fi 24 is a bottom plan view of suchhamlner;

F 25 is a to a V of he hamm r r d alone; v,

. F 6 is a .r ar elev qn ew -1 n lock alone; A

Fig. 2'7 is a side elevational view of the same; F 28 is a top a iew o the o k lev rssembly;

Fig. 29 is an end view of the part of Fig. 28, the

view being taken looking from the right n Fig. 28;

5 Fi 0 is al e a al v o e saiiy 91; p

Fig. 31 is a side elevational view of the pivot plate of the gun;

Fig. 32 is a top plan view of such pivot plate;

Fig. 33 is a top plan view of the sear of the gun;

Fig. 34 is a side elevational view of the sear;

Fig. 35 is an end elevational view of the same the View being taken looking from the right in Fig. 34;

Fig. 36 is a side elevational view of a rocker pivot or shaft of the gun; and

Fig. 37 is an enlarged detail sectional view taken as along the line 3'|3| of Fig. 36.

Referring in detail to the drawings the gun of the invention is herein disclosed as embodied in a shoulder rifle adapted for military use. The un comprises a barrel 4!] which may be of the usual construction, a frame 4| mounting the operating parts of the gun, and a stock 42. A cartridge clip is shown associated with the gun and the construction and functioning of this clip and of the other parts now to be described will be made clear.

At its outer or forward end the frame 4| (shown alone in Figs. 19, 20 and 22) has a threaded bore 43 into which is threaded the reduced rear or breech portion 44 of the barrel as best shown in Figs. 4 and 9. Below the frame portion containing the mentioned threaded bore is a rib 45 straddled by the inner or rear portion 46 of a hand guard 41 located at the under side of the barrel 40. A screw 48 passes through the bifurcated end portion 46 of the hand guard and through the rib 45 and (see Fig. 11) is threaded only in the metal rib.

A plate 49 on the forward end of the stock 42 includes strap like upper and lower extensions 50 disposed against the upper and lower edges of, the stock and a'screw 5| passes through such extensions and the stock and secures the plate to the latter. The upper extension 50 is somewhat longer than the lower extension and a second screw, a wood screw 5|A, passes through the upper extension and into the stock 42. Plate 49 is usedin securing the stock 42 to the frame 4| and to such end is provided in its forward face with a vertically extending groove 52 undercut to provide beads 53 at opposite sides of its entrance. Groove 52 tapers laterally whereby it is wider toward its lower end. In the inner wall of said groove toward the lower end thereof the plate 49 is provided with a notch 54 which, in the assembledgun, cooperates with a spring pressed catch as will appear.

At its rear end the frame 4| is provided with a rib 55 undercut in its sides flush with the rear end of the frame whereby it is laterally grooved as shown best in Figs. 1 and 3. This rib 55 tapers laterally whereby it is widest toward its lower end. In its lower rear portion frame4| is provided with a socket 56 opening through the rear side of the rib 55 and within said socket is a coil spring 51 constantly urging a catch 58 into a projected position. A laterally extending pin 59' rigid with the catch 58 projects from the side of the frame 4| (see Fig. 2) and passes through a slot 60. Wit h this arrangement it will be clear that the pin 59 may be manually operated to retract the catch 58.

In assembling the stock and framethe parts are moved relatively in a vertical plane as the gun is viewed in Fig. 2. That is, the parts are arranged with the rib 55 of the frame aligned with the groove 52 ofpthe stock late 49 and then either or both of said parts are moved to locate the rib in such groove. As the rib and the groove are both tapered the rib is snugly received in the groove and the beads at the sides of the front entrance to the groove are received in the grooves at the sides of the rib.

Catch 58 is normally projecting and as the parts are moved together the upper forward edge of the catch is engaged but being bevelled as shown is cammed back into socket 56 until the notch 54 comes opposite the catch (at this time the parts are assembled) and the spring 55 then projects the catch so that its forward portion enters notch 54 locking the stock and frame together. It is noted that the lower edge of the catch is at a slight angle to facilitate its entrance into notch 54 and has a slight tendency to further urge the stock and frame into proper relation. To again separate the stock and frame the pin 59 is used to withdraw the catch from notch 54 whereupon the stock and frame are separated by relative movements in the direction of the length of the rib 55 and the groove 52.

Frame 4| as herein disclosed is, a one-piece construction closed at its sides and .bottomedge and open at its top edge. As willlappear this frame. is substantially hollow and contains the operating mechanism of the gun. In its side walls adjacent its upper edge the frame is provided withlongitudinally extending grooves 6| opening through the rear end of the frame where the latter is pinched in as at 62 and at the forward end of the frame but short of the extension 63 containin the threaded bore 43, curved outwardly as at 64 (see Fig. 21). In its upper side immediately in the rear of the extension 63 the frame is provided with a U-shaped recess 65. Closing the upper open edge of the frame, 4| is a cover generally designated 66. This cover straddles the upper. frame edge and includes inwardly extending ribs 61 located to enter the grooves 6| when the cover is on the frame. For the most part these ribs are parallel as in. the caseof the grooves but toward their forward ends the ribs are curved outwardly at 68 in the manner in which the grooves 6| are curvedoutwardly at 64 (see Fig.21). v Cover 66 includes a hollow raised portion, 69 containing a relatively long coil spring '|9 which when the gun is in use'serves to move and retain a bolt as will appear. A slot 1| opens through the forward end of the cover laterally of: portion 69 Such slot provides for the operation, of manual means for retracting the gun bolt as will beset forth. The forward slotted end 12 ofthe cover is rounded or shaped to fit snugly in the U-shaped recess 65 in the top of the frame as shown inllf'igs. 1 and 3 and also in Fig. 21. p p Q In this way the slotted end portion of the cover is prevented from becoming spread from the slotduring use of the gun. Further the outwardly curved rib portions 68 of the cover being located in the outwardly curved groove portions 64 when the cover is in place the free end 12 of thecover is prevented from being pinched in on the slot during use of the gun. For free operationofthfi manual bolt retracting means this slot should be maintained constant and with the'describedconi struction it is maintained constant" Rearwardly of cover 66, frame4ljis provided with a vertically disposed socket l3 inw'hich is located a detent 14 urged to a projected position by a small coil spring 15 bearing against:

the inner end of the socket and scured 'at its outer end to said detent. When thecoverfis fully in place,(Figs. 4 and 9) the reduced diameter end portion 16 of detent projects from the frame 4| and engages the rear end of the cover preventing-' rearward movement tliereot, iitlius maintaining it .zposition: Atthe samo time the" rear portion of tne coven is overthe larger diameter portion of the detent retaining the latterin position. When the cover is to beremoved the detentis depressed and-then the cover may simply be slid rearwardlyofi ther ramea A rear-gun site TI issecured "on the-rear portion of the-{cover as lay a bracket 18 although: any other means for the statedpurpose may lqe used'. l Frame 4 I contains a' hreech fholt i' generaily designated I9. a hannner generally'designated 809a sear generally designated a trigger generallyf'de'signated 02; a lock generally designated 83; a lock lever geherally designafied84 and a trip device generally designated 85. The upper fforward end portion 06 oi'the -fr'ame l designate as" a loodin chamber and shells oicartridges are supplied to such chamber froin a-clip- 01 and are moved one at a time fromsuch chamber intothebreechof theha'rrel ilh i l Clip 81 comprises an elongated sheetjmetal casing-closed at'its sides and including" ahottom wall fid. At the upper endof the clip its side walls 80 and '90 are bent or curved inwardly slightly but such upper "end isopen-as best; shown in Fig. l0; Frame M has an opening in its lower edge at 9-! iseeFig 22) and the clip is moilnted on the g'lll'lfdl on'the frame ofthe gun by insorting the upper end or the clip into thejframe throughthe opening 91.

Edge wall=-92--of the fclip is provided with a vertical groove 93i An opening 95 is provided iii-wall 92 and while the groove 03 is shallow in the wall ortion94 above said opening it provides for-clearance betweenthe inner end of a latch 9B (to bedesoribed) and the butt'ends of cartridges in 1 the clip. When the upper portion of the clip is inserted into the fra-methrough the opening 91 a-=1atch- 95 carried by the frame enters the opening 95 in the "edge Wall of the clip and enter'ing under the portion 94 of said wall supports the clip in proper "position. The manner inwh-ich the latch '96 is mounted will be described.

--In-Fig. 4 theclip is full anda comparison of suchfigure and 10 will show that the-clip is-of slightly less Width than the diameter Of two cartridges so that the latterarearranged in a staggeredrelation. A follower 01 in the lower p'ortion of the clip is constantly urged upwardly therein by a coil spring 989 The arrangement is such that each-timejth bolt 19 moves forwardly from the position of 'Fig; 9to that of Fig. 4 it takes" the uppermost cartridge from the clip 81 and moves such cartridgeinto the gunbreech.

anedge of the follower 91 is a tongue-'09 disposed in the groove93 in wallportion 92. "As the'cartridges are taken "from the upper portion or the clip the follower is raise'din thei-clip by the spring 90." The relative-sizes'of the parts are such'that when'the last cartridge has been removed from the 'clipby the bolt 19 the follower is just slightly above the position in 'w-hich it is shown in Fig. 9 and the tongue 99 engagesthe projecting portion of the latch 06 and pains the cost slot 103 as best'shown in Fig. 2.. With this arrangement the latch may be manually retracted torel'ease the clip 81 whenever thatis desired;

Bolt 10 comprises essentially a rear part I04, a front part I05 partly telescoping into saidrear part, a cross pin I06 and a heavy coil spring I01. (see Figs. 12, 13 and 14 for the bolt alone); Part I04 iucludes a hollow tubularportion I00 open-at its forward end and the rear portion of said part is reduced in width and comprises a narrow extension I09. Bevelled surfaces III'I are provided at the rear end of the portion I08 vfor a purpose to be set forth. a i

Bolt part- I05 includes a radial flange III of a size to abut the forward end of part I04 and rearwardly or said flange includes a portion H2 having a sliding lit in the portion 108 of part I04. Forwardly of flange III the part I05 includes an elongated transversely circular portion H3 having a longitudinally extending slot H4 in a side thereof to accommodate an ejector as will appear. Y Y i l In its side opposite slot I I4 the portion I I3 has a groove or recess I I5 undercut in its rear portion as at "I I6 and toward its forward end having a de-.- pression 1. An extractor H8 is disposed inthe groove '5 and has a flanged portion 9 received in the groove portion 6 and lug I20 received. in the depression Ill. In this way the extractor is mounted on the bolt for movement therewith but the forward end portion of the extractor may move laterally with respect to the bolt. Such forward end of the extractor is provided with a tooth-like portion I2I to enter the groove usually provided adjacent the end of a shell or cartridge.

When assembling bolt 19 the coil spring I01 is dropped into the part I04 and a relatively light coil spring I22 is dropped into a socket I23 in the part I05. Then portion I2 is disposed-inthe tubular portion of part I04 and the parts forced together against the tendency of spring I01. When transverse openings I24 and I25 in the parts I04 and I05 respectively are in register the cross pin I06 is passed into such openings.

Toward its upper end pin I06 is provided with portions I26 and I2! rounded in the direction of the length of such pin. Through pin I06 is a re(:- tangular passage I28 and in the front face of such pin is-a rectangular recess or socket I29 through the intermediate portion of which the passage I28 opens. As will be clear from Fig.- 16 the longltudinal axis of the passage I28and the socket I29 are at right angles to one another. a

Movement of pin I06 downwardly through openings I24 and I25 is limited by a wall I30-of the bolt portion I08 (see Fig. '14). Adjacent the rearface of the pin I 06 the bolt part I05 has its portion II2 cut away as at I3I in Fig. 14 and in the same figure it is noted that the part is slotted at the inner side of wall I30 providing-a groove I30A receiving the lower end portioniof pin- I06 to prevent the latter turning about its own' longitudinal axis. An opening 43.2 isp-ro vided through bolt portion I08 forwardly .oiits wall portion-[wand such wall portion is bevelled on its outer-side at 133. leading to such opening. Inlinewith the opening I32 the lowerlendof, pin 106 cut away at 34 and a 'recess or cavity I35 is provided in the forward face of the lower pore tionnf the pin.-. 4

When the partsoi the bolt have been assembled as .desoribedfa firing pin :1 36 assembled in the bolt.- To receive the firing pin the bolt is pro-1 videdwithra longitudinally extending recess pass-.- ing lzentirely through the bolt and; of reduced-me ameter forwardly of the socket I23 receivingthe spring I22. Firing pin I36 also varies in diameter and its forward portions have a sliding fit. in the described passage through the bolt. Intermediate its ends the firing pin I36 is provided. with a lug -"I31 in one plane extending beyond opposite sides of the pin but in the other plane being of a width equal to the diameter of the pin.

The firing pin is inserted into the assembled bolt by entering the small diameter end or firing point I38 of the pin through the rear end of the bolt with the lug I31 aligned with the passage. I28 through the pin I06. When the lug is moved forwardly of the pin I06 the firing pin is rotated through ninety degrees to carry the lug I31 out of alignment with the passage I28 and into alignment with the socket I29. At such time the firing pin spring I22 is somewhat compressed and after the firing pin has been rotated as stated it is released and the spring I22 expands and forces the lug I 31 of the firing pin into the socket I29 as best shown in Fig. 14. a

A slot I39 may be provided in the rear end of the firing pin I36 for the reception of a bit, as of a screw driver or the like, whereby the pin may be more easily turned either in assembling it in thebolt or to remove it therefrom as when the bolt is to be disassembled for cleaning or rep-air or replacement of parts. From Fig. 12 it will be noted that normally the spring I22 maintains the firing pin in a retracted position with its point I38 within or flush with the forward end of thebolt 19. 7

Attention is further directed to the fact that the spring I01 maintains the parts I04 and I with: the portion I40 of the former against the forward side of the curved portion I26 of pin I06 and-with the portion I4I of the latter against the rear. side of .the curved or rounded portion I21 of said cross pin. In this connection it; will be observed in Fig. 14 that normally the radial flange of part I05 is spaced slightly from the forward open end of the tubular portion I08 of the part I04. This space or clearance indicated at I42A has a purpose as will appear.

In the assembled gun the bolt 19 is disposed in the-upper portion of the frame M and is slidable back and forth therein between a retracted position'as shown in Fig. 9 and a breech closing positior'ias shown in Fig. 4. The bolt fits between the side walls of the frame and on shoulders I42 provided on the inner sides of the frame walls and is held against upward movement by the cover 66. Intermediate the frame ends the side walls thereof are hollowed out internally interrupting the shoulders I42 but providing vertical channels I43 opposite one another in said walls. (See Figs. 19 and 20.) In the bottom wall of the frame between said channels I43 is a well or recess I44.

Look 83 (see Figs. 26 and 2'7 for the lock alone) comprises a body including a bifurcated portion providing a pair of upstanding arms I45 and I46 and 2. depending portion I41 having a socket I48 opening through its lower end and having a notch I49 in its rear side and a step portion I50 below said notch. The lock body between its arms I45 and I46 is bevelled as at I-5I and the forward faces of said arms are provided with bevels I52 although it is noted that the latter do not extend to the outer side edges of the arms and do extend to the inner side edges thereof and'also to the upper ends thereof. In addition to the above each of the arms I45 and I46 at its upper rear side carries a lug or projection I53. Here it is noted that the mentioned arms of the lock are spaced apart so that the space I54 between them is of the width of the narrow portion I09 of the bolt 19.

.The lock lever 84 cooperateswith the lock 83 and the bolt 19 and such lock lever (for the lock lever alone see Figs. 28 and 29) comprises a hub portion I55 pivotally mounted on a pin I56 supported by the side walls of frame 4|. A short arm or toe I51 depends from said hub I55 and a rather long arm I58 is likewise integral with said hub. Portion I51 is shaped to be received in the notch l49 of the lock 83 while the arm I58 extends forwardly in the frame 4|. A resilient leaf spring element I59 is secured to the underside of the forward portion of arm I58 as by a rivet or the like I60 and such element passes upwardly about the forward free end of said arm and at the upper side thereof is provided with or bent to provide a hook-like portion I6I. A lug I62 is integral with the element I59 and projects laterally thereof for a purpose to be set forth.

In the assembled gun (see Figs. 4 and 9) they hub I55 of the lock lever is located rearwardly of the lock'83 and the long arm I58 of such lever extends forwardly between the arms I45 and I46 of the look; A coil spring I63 having an end portion disposed about a guide pin I64 and having its upper portion in the ocket I48 normally maintains the lock 83 in the elevated position of Fig. 4 but is adapted to permit of the lock being forced downwardly to the position of Fig. 9.

Hammer (shown alone in Figs. 23 and 24) comprises a body or block of metal having an opening I65 therethrough toward one end thereof for the passage of a pivot I66 for mounting the hammer. In spaced relation to said opening the hammer has a bearing recess I61 communicating with the lower sideof the hammer through a slot I68 arranged parallel with the pivot opening I65. A slot I69 at right angles to the pivot opening passes through the lower side of the hammer and the end thereof remote from said pivot opening and in addition enters the slot I68. At the under side of the hammer below the pivot opening I65 thereof is a shoulder I10 adapted to be engaged by a sear for securing the hammer in cocked position.

Associated with the hammer80 is a hammer rod generally designated I1I (shown alone in plan view in Fig. 25) comprising an elongated rod or body I12 provided at its forward end with a T-like head I13 and inwardly of said head with a shoulder or portion I14 of increased size. Hammer rod MI is assembled with the hammer 80 by aligning an end of the head I13 with the bearing recess I61 and the shank portion I15 with the slot I68 and then moving the parts relatively laterally to dispose the head I13 in the bearing opening or passage I 61 and the shank part I15 in alignment with the slot I69 and then swinging thehammer rod with its head I13 as a pivot to dispose rod portion I15 at the inner or top portion of the slot I69. A coil spring I16 is assembled on the hammer rod and the manner in which thelhammer and hammer rod are assembled in the gun frame M will later be fully set forth.

The sear 8| (shown alone in Figs. 33, 34 and 35) is located below the hammer 80. This sear comprises an elongated metal body having a socket I11 opening through its rear wall. The body of the sear is hollowed out whereby it includes a pair of spaced walls I18 and I19 at each side'of a recess or space I80 the forward portion oi. the lower sidcoi which is closed by a bottom wallportion 18!. A'projecticn or extension I82 on the vforward end of the sear provides a flat plate like portion I83 and inwardly of such portion and at the under side of-thesear the said extension is provided with a recess I84 extending but part way across the said extensionto leave a wall portion I85. The-walls I'IBand I719 of the sear are provided withoppositely located somewhat elongated openings I86..

Trigger 82 comprises a substantially L-shaped piece including theportion I91 tobe engaged by the finger of the operator and a head-like portion I88 of a width to be received between the walls I18 and I19 of the sear. Through its body the trig er is provided with an opening and in the assembly this opening-is alignedwith the openings I 86 in the walls of'the sear and a pivot pin I89 is passed through such aligned openings to mount the trigger for pivotal movement and the sear for both pivotal movement and a slight movement. in the direction of its length. This latter movement is provided for by the elongated openings I86 in the walls of the sear. Inthe under side of the head-like portion I88 of the trigger is a socket I90 partly receiving a small coil spring I 9I when the trig er is assembled in the gun frame. A somewhat similar sprin I92 enters the socket I TI of the "sear in the assembled position of the latter.

The pivots I56, I66 and I89 are all carried by a pivot plate I93 located at the outer side of the frame M. In assembling the parts in the said frame it will be understood that the sub-assemblies of the bolt and the hammer and hammer rod are completed outside of the frame' The scar is inserted into the frame with the trigger the finger portion I81 of the latter passing through an opening I94 in the lower wall of the frame. Next the hammer is lowered into place and then the lock 83 and the lock lever 84. The pivot plate is applied by moving it sidewise to insert its pivots I56, I56 and I89 through the aligned pairs of holes I95, I96 and I 97 respectively providedin the side walls of the frame 4|. I Hammer rod I12 passes through an opening I98 in the rear end of the frame, and through an aligned hole I99 in the plate 4 9 and into a socket 290 in the stock 42. Now spring I16 bears against shoulder I" of the hammer rod and against the rear end of the frame about the opening I98 and constantly tends to move the hammer rod inwardly of the frame t move the hammer through a firing movement.

In the upper portion of plate 49 is a socket 2M communicating at its lower or inner end with the passage I99 through said plate. This socket may-open through the bottom wall of the groove 52 in said plate and as shown in Figs. 4 and 9 is at an. angle to such groove, Socket 29I opens through the upper end of. plate 49 but at such upperend is of reduced diameter.

Socket .2! receives a detent 202 including a reduced diameter'porti'on 293 adapted to project through the upper edge of the plate 49. A coilspring 204' about such reduced diameter portion is constantly urging the detent inwardly -01: the socket 29I. The innerportion of the .detent is inclined as at 295 so that the maximum the spring may move the detent inwardly is-- until such inclined portion of the latter engages the portion of rib-5.5 exposed where the socket comes through the wall of the groove 52.

wardly sufilcient to have the outer end or the same just inwardly of the upper edge of the plate 49 so that the outer end of the detent will not be contacted if the thumb is run over the upper edge of such plate. However whentheha'rnmer is in cocked position as in Figs. 4 and 9 the hammer rod III is in position maintaining the detent upwardly against the tendency of the spring 294.

Therefore, even in the dark the userof the gun may determine whether the hammer is in cocked position it being merely Iiecessaryto a finger or thumb over the upper edge of the plate 49. If the detent portion 203 is exposed to be felt then the user is advised that the gun is cooked. Whenthe hammer is forward in on: cocked position the rod III will move" forward with it and the spring 204 will move the' detent into the socket 2!. The detent will be again forced outwardly to tell-tale position when the hammer is next swung back to cocked position.-

, In-using the gun as a semi-automatic firearm the operation is. as follows: In Fig. 4 the gun is ready for firing and it is noted that a shell or cartridge 206 is in the firing chamber or breech of the barrel, the boltr'I9 is in breech closing po-l sition and the hammer 89 is in cocked position being held there by the sear as will be explained,

When the bolt "I9 is. in forward breech closing.

p sition the lock 83 is in its upper position with its bevelled surfaces I52 engaged by the'bevelled surfaces IIO of the bolt, r

Lock lever 84 has its long arm I58 in substam tially horizontal position with the hook-like p01; tion IGI of the resilient element I59 located in the notch or recess I35in the lower forward face of the cross pin I06. In addition the toe-like portion I5! of the lock lever is located in the notch I49 of the lock. Thus the bolt I9 is lockedin breech closing position since it is held by the look 83 and the latter .may' notbe depress'edas' it is secured in its upper position by the lever 84.

At this same time the sear 8| is in its rearward position with its forward portion raised and with its corner or shoulder 20! engaged with the shoulder I10 of the hammer whereby the spring I16 about such hammer rod may not-force or rock the hammer forwardly about its pivot I66. The head portion I88 of the trigger is on the bottom wall portion I8I of the sear, such head portion of thetrigger being held up by the trigger spring I9I. V Now if the trigger is pulled its head portion I88 will be drawn downwardly and will rockthe sear downwardly on pivot I89 to carry the shoulder 20'! of the sear from engagement with the shoulder I10 of the hammer releasing the latter to the influence of the spring I16. -Such spring snaps the hammer forwardly and the latter striking the rear end of the firing pin I 3'5 drives the same forwardly against the tendency of spring I22 to fire the shell 206. The results on the bolt I9 will later be described. I M Immediately the sear is depressed bythe t is ge'r as described and is freed of the hammer the sear spring I92 moves the sear forwardly as allowed by the elongated openings IRS in the side walls of the sear. The sear may move forwardly until its wall portion I8I moves clear. of the head portion I88 of the trigger whereupon the sear will be'pivotedabout pivot pin I89 in a manner-i raise the forward end of the sear. 1 1 The described pivoting 0f the sear comes about Thus he spring may only move the detect in: To since the sear spring I92 is located below the pivot pin I89 and thus has a tendency to rock the sear in the manner indicated. With the sear tilted up as described its corner or shoulder 201 will be again in the path of movement of the shoulder I10 of the hammer and when the latter is moved back to cocked position its shoulder I10 will be engaged and held by the sear.

This is true regardless of whether the trigger has been released or is held in the position of Fig. 9. If the trigger has been released it will move from the position of Fig. 9 to that of Fig. 4 and in such instance when the hammer in its return movement engages the sear it will force it back to the position of Fig. 4 against the tendency of the sear spring I92 the hammer of spring I16 being stronger. Then the bottom wall portion I8I of the sear will again be under the trigger head portion I88 ready to be depressed to again release the hammer.

Referring back now to the time of the firing of the shell or cartridge 206. As the cartridge is fired the initial force of the explosion forces the forward bolt part I back toward the part I04 compressing the spring I01 an additional amount. The part I04 is being held since its shoulders IIO are against the bevelled surfaces of the lock 83 and the latter is secured in its upper position. Therefore the parts I04 and I05 hav only the slight additional telescoping movement allowed by the clearance I42A. This results in a shiftin of the pressure contact between part I05 and the rounded portion I21 of pin I06 .from point I40 to a point 208 at the forward side of said pin.

Therefore the pin is rocked in the direction of its length as its portions I26 and I 21 roll on pressure point I40 (between pin portion I26 and bolt part I04) and pressure point208 (between pin portion I21 and bolt partl05).- Thus the lower end portion of the pin I06 is shifted backward to engage thecorner 209 of the bolt part I 05. This releases the hook portion I6I of the element I59 from the notch I35 in the pin I06 and allows the lock lever 84 to rock slightly about its pivot I56 in a direction to have its long arm swing downwardly.

However, the movement is limited since the hook I6I merely drops onto the upper side of the wall portion I30. Now immediately the initial explosive force of the cartridge on the bolt is expended (and this is almost instantly. as the bullet has left the barrel 40) .thespring I01 operates to move the bolt part I05 back to normal relation to bolt part I04 and this involves a return of the pin I06 to normal relation to such parts. As the pin swings back it kicks the hook I6I oif the upper side of wall portion I 30 and the lock lever 84 then, being urged by the lock 83 acting on toe I51, swings about itspivot I56 to theposition of Fig. 9.

This carries the toe I51 of the lock lever out of the notch I49 in the lock 83. Therefore the lock is being ma ntained in its upperposition only by the spring I63 and the continuing expansion of the gases of the explosion against the casing of the exploded shell forcing the latter against the bolt the latter is forced back. During the backward movement of the bolt its bevelled surfaces I I0 acting on the bevelled surfaces I52 on the lock cam the latter downwardly against the tendency of spring I63 so that the latter is compressed as in Fig. 9. As the bolt goes back to retracted position it rides over the hammer forcing the same back so that the shoulder 291 of the sear may be engaged with the shoulder I of the hammer to secure the latter in cocked position. Further the bolt rides the upper fiat ends'of the arms of. t e

lock 83 maintaining the same depressed and in the extreme rearward position of the bolt it is holding the lock down by engagement with the extensions or lugs I53 on the upper ends of the arms of the look. A cushion 2I0 protects the parts at the end of the rearward movement of the bolt and this cushion may be a piece of fibre or the like secured in place as with rivets 2H and having an opening 2I2 to accommodate the rear end of the firing pin I36.

As the bolt moves rearwardly it carries the "extractor I I8 with it and the latterrmoves the empty shell casing with it. In a side wall of the frame 4| is an elongated opening 2 I3 and opposite such opening is an ejector 2 I 4 comprising a metal plate mounting a pin 2I5 projecting through the side wall of the frame and entering the groove or slot I I4 in the bolt. Thus as-the shell is drawn rearwardly with the bolt it is brought into'engage-' ment with the pin 2| 5- and is caused to swing about and is ejected through theelongated opening 2I3 in. the frame.

The coil spring 10 in the cover 66 bears at its forward end against a vertical extension 2I6 which extends into the spring chamber 69 of the cover. Thus when the bolt is forced rearwardly spring 10 is compressed. As the pressure is exhausted the spring 10. acts to again advance the bolt to breech closing position and as the bolt is advanced it takes the uppermost shell from the clip 81 into the breech of the barrel.

Just before the bolt reaches breech closing position the lock 83 begins to rise under the urging of spring I63 and it moves the lock lever swinging the long arm I58 of the latter upwardly. The hook I6I of the springelement I59 is sprung over thebevelled or cammed surface I33 of the wall. portion I30 and moving through opening I32 enters recess I35 in, pin I06. At the same time lock lever toe I51 enters notch I49 of the lock securing it inelevated position. Nowthe gun is again ready to fire and the bolt is in breech clos-,

ing position and is secured therein by a latch means releasable by the initial pressureof the ex-. plosion of a shell.

The gun includes a safety device whereby the sear may be locked against movementbythe trigger so that the gun will not be accidentally discharged. To the indicated end a pin 2I1 (shown alone in Fig. 30 and shown. also in Figs.

4 and 9) is arranged in an opening 2I8..extending transversely of the frame 4I beneath thefqr-l ward portion of the sear 8|. While the. opening 2I8 passes through the opposite side walls of the frame it is more in the nature of a groove in the bottom frame wall as shown in Fig. .19. h

Pin 2I1 is cut away intermediate its ends whereby it is provided with a pair of step-like portions including the higher portion ,2 I 9 ,and the lower portion 220. At a point spaced from the mentioned steps the pin is provided with depressions 22 I and 222 connected by a groove 223. In

a socket 224 in the frame 4| 2. plunger 225 is con stantly urged against the 'pin 2 I1 by a small coil spring 226. Frame 4I is recessed in its opposite sides to receive the ends of pin 2I1 so that the latter does not project beyond the extreme outer,

side surfaces of the frame.

The outer end of the plunger 225 is normally in either the depression 22I or the depression 222 securing the pin 2I1 against casual movement; When the pin is so positioned that its high step 2I9 is under the wall portion I85 of the sear the latter may not be depressed and so the hammer cannot be released and the gun will not be accidentally discharged; When the pin is shifted to'bring the step 220 under the sear wall portion I85 the sear may be depressed and the gun fired in the usual manner. When the gun is on safety the plunger 225vis partly in the depression HI and when the pin 2H is shifted the outer end of the plunger, is in groove 223 during the shifting movement and then being in depression 222 makes the gun ready for firing. c

When the last cartridge is taken from the-clip 81 the latter is dropped fromits position on the gun, Before firing such last. cartridge the operator should insert another clip of cartridges. If he fails to do so the last cartridge will be fired and the bolt will move back as described and will then move forward to breech closing position on an empty breech and. to a. position closing the loading chamber 88 to the entrance of a carg tridge.

Means are provided whereby under these circumstances the bolt may be manually retracted. Such means includes a handle or finger piece 221, a connecting part 228 passingthrough the slot II in the cover 66,, a rod-like portion 229 guided by the bolt, the frame and the cover, and a latch release 230 pivoted on the bolt I9 by a lug 23I entering a recess in the side of the bolt as best shown in Figs. 12 and 13. 4

Part 230 is disposed in a. vertical-slot or groove in the side of thebolt part I04 and has its lower end disposed at the side of the laterally extend ing lug I82 of the resilient element. I59 carrying the latchhook I8]. Thus the initial movement of hand piece 22? serves to rock the part 230 on its pivot 23! to have its lower bevelled end 230A engage the lug I82 and release the hook IB'I from the recess I35 in the pin I and cam the hook downwardly.

Latch lever 84 is then free to drop down and the bolt may be slid rearwardly in the frame 4| to cam the lock 83 out of the way and against the tendency of the coil spring I0. This is not a heavy spring and the spring I63 supporting the lock 83is not a heavy spring. Therefore once the lock lever is released, the bolt may be retracted by the movement of hand piece 221 without great effort. When the bolt is retracted if a new clip of cartridges has been inserted a cartridge of such clip will be moved into the gun breech by the bolt on release of the latter for movement to breech closing position.

The gun of the invention as above described is. semi-automatic in its operation. The trip .85 and its mounting provide for use of a gun as a full automatic weapon. Trip 85 is mounted on the eccentric intermediate portion 232 of a shaft or pin 233 (shown alone in Fig. 36). Shaft 233 is mounted by the side walls of the frame M and includes a hand or finger piece 234 which in the assembly is located at the outer side of the frame at one side of the latter and an end'portion partly grooved to provide oppositely located flats (see Fig. 37) 235 and 236 beyond the outer side of the frame. In the assembled gun the groove in the end of shaft 233 receives the finger like portion 23'I of the pivot plate I93 whereby the latter and the shaft are both secured in place against casual displacement. I

Trip 85 is a substantially T-shaped element comprising a stem 238 having a cam-like hump 239 on one side. Shaft 233 passes through the head portion of the trip and such portion ineludes arms 240 and 24I the latter having. a notch or recess 242 adjacent its free end. Since the shaft 233 has fixed bearings in the sidewalls of sun frame 4| as in the openings 243. it will be understood that as the hand piece 234 is used to rock said shaft through 180 degrees the eccens trio portion 232 of the shaft will be moved forwardly and rearwardly and the trip being on such portion of the shaft will --be shifted in like manner. i It is thisshifting of the trip 85 that changes the. gun from. semi-automatic to full automatic and vice versa. Preferably the outer side of the frame is marked asin Fig. 2 with the words fsingle" and Full auto. so that in association with the position of the finger piece 234 the oper ator willbe advised as to the'position of the trip 85 within the frame and will know that the gun is set for semi or full automatic operation.

When the trip 85 is in its position toward the barrel 40 it has no part in theoperation of the gun. However when it is shifted toward the stock of the gun it enters into th operation. of the gun and makes the same fully automatic. With the trip shifted toward the stock (as-in Fig. 9) the notch 242 of the trip is positioned over the forward flat portion I83 of thesearwhen the latter ismoved forward by. its spring I92 on the trigger being pulled. When the trigger presses thesear down to release the hammer the spring I92 moves the. sear forward so that the bottom wall portion .I8I of the sear clears the head portion I88 of the trigger and such head portionmoves into position at the rear of said wall portion all as in Fig, 9.

Now the operator simply holds the trigger de pressed and thisprevents the sear being moved back by the hammer when the latter is cleared byrthe bolt on movement of the latter to breech closing position. -However the corner 201 of the sear catches the shoulder of the hammer.

As the bolt approaches breech. closing position the lock 83 starts up'to bolt locking position and as theparts reach home the toe I50 of the lock hits the underside ofthe'arm 240 of the T-shaped trip 85and rocks the trip on its shaft to have the portiony242of the trip engage portion I83 of the sear and depress the latter releasing the sear fromthe hammer so that the spring I18 maysnap the hammer to fire the-gun. When the gun isfired the bolt comes back'in the manner above described and the lock 83 is again depressed and the under side of its toe I50 engages the hump 239 on the stem portion of the trip rocking the latter back to normal position. As the bolt moves to retracted position the expended shell casing is extracted from the breech of the gun and ejected through the slot in the frame M. Then. as the bolt moves back to breech closing position it moves another shell into the gun breech and the toe I50 of the lock 83 again rocks trip 85 to depress the searv and again release the hammer. I The described operation is automatically repeated while there are cartridges left in the clip 8land the triggeris held back or depressed to prevent such rearward movement of the-sear as would carry its portion I83 from under the notchedportion 242. orthe triparm 24I. On turning 0f the shaft 233. to move the trip 85 toward the barrel 40 the automatic feature of the gunis not available and the gun is then a semiautomatic weapon. When shaft 233 is in one of the mentioned positions its fiat 235 is against the pivot plate portion- 231 and when the shaft is in the other position its flat-. 230 is against said pivot plate portion. vThere is a sort of spring action of the plate portion 23!- so that the oper at'or can' feel when the shaft has been turned a half turn and need not be in a position to see just what he is doing.

Ejector plate 2| 4 in addition to the pin 2|5 carries a lug 244 (see Fig. 8). In the frame side wall is an opening 241 through which the ejector pin 2l5 passes and at opposite sides of such opening are recesses 245 and 246 each adapted to receive the ejector plate lug 244. Pin 2|5 is threaded into the hole 241 the latter being tapped and is then looked in position by the entrance of the lug 244 into one of the recesses 245 and 246. That is the pin is threaded home as much as possible and then the lug 244 is snapped into the most convenient of the recesses 245 and 246 it bein understood that the plate 2l4 is of spring metal.

Having thus set forth the nature of my invention, what I claim is: 1. A bolt for a gun of the character described comprising a pair of partly telescoping parts, a heavy spring tending to separate said parts longitudinally, a cross pin locking said parts against separation by said spring, and said pin including surface portions pivotally engaging the respective parts and rockable thereon for tilting of said pin on further telescoping of said parts in opposition to said spring.

2. A bolt for a gun of the character described comprising a pair of partly telescoping parts, a transverse pin through said parts, a heavy spring tending to prevent further telescoping of said parts and prevented from separating them by said pin, and said pin including surface portions rounded in the direction of the length of said pin and engaging the respective parts and movable thereon for tilting of the pin on further telescoping of said parts.

3. A bolt for a gun of the character described comprising a pair of partly telescoping parts, shoulders on said parts and positively limiting their telescoping movement, a cross pin through said parts, a spring tending to separate said parts and forcing them against opposite sides of the upper portion of said pin and normally maintaining said shoulders slightly spaced, said parts relieved at the inner side of the lower portion of said pin, and said pin having surfaces on its upper portion pivotally engaged by said parts whereby the pin rocks on said parts and moves to a tilted position as said parts are further telescoped and prior to engagement of said shoulders.

4. A bolt for a gun of the character described comprising a pair of partly telescoping parts,

.shoulders on said parts and positively limiting their telescoping movement, a cross pin through said arts, a spring tending to separate said parts and forcing them against opposite sides of the upper portion of said pin and normally maintaining said shoulders slightly spaced, said parts relieved at the inner side of the lower portion of the pin, and said pin on its upper portion having surfaces rounded in the direction of the length of the pin and engaged by said parts whereby said portions are movable on said parts to cause tilting of the pm as said parts are further telescoped and prior to engagement ofsaid shoulders, 1 5. A bolt for a gun of the character described comprising a pair of partly telescoping parts, a cross pin extending transversely of said bolt and securing said parts together, a firing pin in and movable longitudinally through said bolt, a coil spring in said bolt and normally retaining said firing pin in retracted position, said firing pin passing through said cross pin and securing it in position, and said firing pin and cross pin including cooperating parts limiting retracting movement of said firing pin by said spring.

6. A bolt for a gun of the character described comprising a pair of partly telescoping parts, a cross pin extending transversely of said bolt and preventing separation of said parts, a spring constantly tending to separate said parts and causing portions of the latter to press against opposite sides of said pin, a firing pin extending longitudinally of said bolt and transversely through said cross pin, said cross pin having an unsymmetrical recess in its forward face, an unsymmetrical lug on said firing pin, a coil spring in said bolt about said firing pin and normally maintaining the latter in retracted position with its lug entering said recess, and said cross pin having an unsymmetrical passage therethrough at right angles to said recess whereby the firing pin is assembled in the bolt by passing its portion including 'said lug through said passage in the cross pin and then rotating the firing pin through its longitudinal axis to align its lug with said recess whereupon said coil spring shifts the firing pin to dispose its lug partly in said recess.

'7. In a gun, a'barrel, a frame at the rearof said barrel and including a loading chamber in its forward portion, a bolt in said chamber and having a forward breech closing position, a bevelled surface on said bolt, a locking element movable to and from looking relation with said bolt, said element having a bevelled surface engaged with the bevelled surface of the bolt when the element is in looking relation with the bolt and the latter is in breech closing position, said bolt, including forward and rearward parts, a spring retaining said parts against casual relative movement, said bolt bevel located on the rearward of said parts, a latch securing said locking element against movement and in looking relation to the bolt when the latter is in breech closing position, said bolt when in breech closing position maintaining said latch in position securing the locking element in looking relation to the bolt, and said bolt parts arranged to be moved relatively against the action of said spring by the force of the exploding of a shell and on such relative movement release said latch whereby to permit said bolt to cam aside the locking element and move to a position rear- Wardly of said loading chamber.

8. In a gun, a barrel, a frame at the rear of said barrel and including a loading chamber in its forward portion, a bolt in said chamber and having a forward breech closing position, a bevelled surface on said bolt, a locking element movable to and from looking relation with said bolt, said element having a bevelled surface en-' gaged with the bevelled surface of the bolt when the element is in looking relation with the bolt and the latter is in breech closing position, said bolt including forward and rearward parts, a spring retainingsaid parts against-casual relative movement, said bolt bevel located on the rearward of said parts, a latch securing said lock-1 ing element against movement an in looking relation to the bolt when the latter is in breech closing position, said bolt when in breech closing position maintaining said latch in position securing the locking element in looking relation to the bolt, said bolt parts arranged to be moved relatively against the action of said spring by the force of the exploding of a shell and on such relative movement release said latch whereby to permit said bolt to cam aside the locking element and move to a position rearwardly of said loading chamber, means whereby the .bolt holds said locking element in cammed aside position until the bolt is again moved forwardly to breech closing position, and spring means to then move the locking element into position with its bevelled the element is in locking relation with the bolt and the latter is in breech closing position, said bolt including forward and rearward parts, a spring retaining said parts against casual relative movement, said bolt bevellocated on the rearward of said parts, a latch securing said locking element against movement and in locking relation to the bolt when the latter is in breech closing position, said bolt when in breech closing position maintaining said latch in position securing the locking element in locking relation to the 'bolt, said bolt parts arranged to be moved relatively against the action of said spring by the force of the exploding of a shell and on such relative movement release said latch whereby to permit said bolt to cam aside the locking element and move to a position rearwardly of said loading chamber, means whereby the bolt holds said locking element in cammed aside position until the bolt is again moved forwardly to breech closing position, spring means to then move said locking element to position its bevelled surface against the bevelled surface of the bolt and means on said locking element operative to move said latch to securing relation to said locking element as the latter is moved by said spring means.

10. In a gun, a barrel, a frame in the rear of said barrel and including a loading chamber communicating with the barrel, a bolt in said frame and having a retracted position rearwardly closing position, said bolt including forward and rearward parts, a spring retaining said parts against casual relative movement, bevelled surfaces on the opposite sidesof the rearward part of said bolt, said rearward part of the .bolt including a narrow part extending rearwardly from said bevelled surfaces, a lock including a pair of arms located one at each side of said narrow bolt portion while the bolt is in breech closing position, a bevel on each of said arms and engaging the bevels of the bolt part when the bolt is in breech closing position, a latch securing said lock in such position, and said parts adapted to be moved relatively on compression of said spring by the force of the firing of a shell and on such relative movement release said latch to permit the bolt to cam the lock downwardly in the frame and then ride rearwardly over the lock to retracted position.

of said loading chamber and a forward breech 11. In a gun, a barrel, a frame in the rear of said barrel and including a loading chamber communicating with the barrel, a bolt in said frame and having a retracted position rearwardly of said loading chamber and a forward breech closing position, said bolt including forward and rearward parts, a spring retaining said parts against casual relative movement, bevelled surfaces on the opposite sides of the rearward part of said bolt, said rearward part of the bolt in eluding a narrow part extending rearwardly from said bevelled surfaces, a lock including a pair of arms located one at each side of said narrow bolt portion while the bolt is in breech closing position, a bevel on each of said arms and engaging the bevels of the bolt part when the bolt is in breech closing position, a latch securing said lock in such position, said parts adapted to be moved relatively on compression of said spring by the force of the firing of the shell and on such relative movement release said latch to permit the bolt to cam the lock downwardl in the frame and then ride rearwardl over the lock to retracted position, and means to automatically return said bolt to breech closing position and said lock to position with its arms at the opposite sides of the narrow bolt portion and its bevelled surfaces against those of the bolt and said latch to lock securing position.

OSWALD O. SUNDERLAND. 

